Hello,
I bought the White Paper "How to Extend RapidMiner 5.0" and I followed the steps shown in page 11 to create my own Extension. Unfortunately Eclipse shows errors before execution

: Project 'RapidMiner_Vega' is missing required source folder: 'src_test'
Help please.
Thank you.
did you checkout the RapidMiner sourcecode here: https://rapidminer.svn.sourceforge.net/svnroot/rapidminer/Vega ?
It contains a src_test folder, so does your local version you checked out contain one as well? If not, please checkout the RM Vega project again.
Regards,
Marco